Okay, I get what you're saying and I went ahead and deactivated almost all my plugins, one at a time, and nothing made a difference.
Right now, the only active plugins are WP eStore and Lightbox 2. I have the box unchecked in eStore settings for enabling lightbox effects.
I also went through the iteration of trying to use the eStore lightbox again, but that didn't work either.
When I look at the page source, I do not currently see the jquery library you mentioned above, only 1.6.1.
Any other ideas?